参数资料
型号: TLV2453AIDRG4
厂商: Texas Instruments, Inc.
英文描述: FAMILY OF 23-uA 220-kHz RAIL-TO-RAIL INPUT/OUTPUT OPERATIONAL AMPLIFIERS WITH SHUTDOWN
中文描述: 的23个家庭,微安220 - kHz的轨到轨输入/输出运算放大器,具有关断
文件页数: 27/51页
文件大小: 1299K
代理商: TLV2453AIDRG4
μ
SLOS218F DECEMBER 1998 REVISED JANUARY 2005
27
WWW.TI.COM
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
APPLICATION INFORMATION
offset voltage
The output offset voltage, (V
OO
) is the sum of the input offset voltage (V
IO
) and both input bias currents (I
IB
) times
the corresponding gains. The following schematic and formula can be used to calculate the output offset
voltage:
VOO
VIO
1
RF
RG
IIB
RS
1
RF
RG
IIB
RF
+
VI
+
RG
RS
RF
IIB
VO
IIB+
Figure 50. Output Offset Voltage Model
general configurations
When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is often
required. The simplest way to accomplish this is to place an RC filter at the noninverting terminal of the amplifier
(see Figure 51).
VI
VO
C1
+
RG
RF
R1
VO
VI
1
RF
RG
1
sR1C1
1
f–3dB
1
2 R1C1
Figure 51. Single-Pole Low-Pass Filter
If even more attenuation is needed, a multiple pole filter is required. The Sallen-Key filter can be used for this
task. For best results, the amplifier should have a bandwidth that is 8 to 10 times the filter frequency bandwidth.
Failure to do this can result in phase shift of the amplifier.
VI
C2
R2
R1
C1
RF
RG
R1 = R2 = R
C1 = C2 = C
Q = Peaking Factor
(Butterworth Q = 0.707)
(
=
1
Q
2
)
RG
RF
_
+
f–3dB
1
2 RC
Figure 52. 2-Pole Low-Pass Sallen-Key Filter
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